Square D 8501-PH31E Three-Phase General Purpose Contactor

Square D 8501-PH31E is a 3-pole general-purpose contactor designed to switch three-phase loads, with a coil rated for 110–120 VAC and operation at 50/60 Hz. It carries a 20 A load rating and a maximum load voltage of 660 VAC, and it provides three normally open contacts plus one normally closed contact, wired via screw terminals for straightforward installation. The unit weighs about 0.71 lb and is part of the Square D 8501 family from Schneider Electric. This specific PH31E variant is discontinued by the manufacturer, so current availability depends on distributors’ stock or remanufactured units. Part number 8501-PH31E identifies this coil-rated, 20 A, 3 NO/1 NC contactor in the 8501 line, designed for control circuits that require a standard-voltage 110–120 VAC coil and reliable switching of moderate three-phase loads. Although discontinued, compatible replacements or genuine stock from authorized distributors may still be available.